The Greens say in a release that they won't contest two Liberal and four NDP constituencies.
They also say they will not run against Alberta Party Leader Greg Clark.
In return, Green party Leader Janet Keeping says she'd like the three left-of-centre parties not to run against her in Calgary-Fort.
Keeping says the Greens have no interest in a merger.
But she adds the Greens would like to co-operate with the other parties to get rid of the 44-year-old Progressive Conservative government.
"We have a distinct set of policies and principles that, as climate change worsens, will eventually prevail," Keeping says of her party. "But we realize Alberta desperately needs a different government as soon as possible."
"A PC party that was a breath of fresh air way back in 1971 has over time taken on a culture of entitlement to power and become little more than the mouthpiece of the hydrocarbon industries (oil, gas and coal) and the wealthy.
"We are ready to co-operate with the other non-conservative parties to help bring about change."